
// #include <Arduino.h>
// /*
//   Button

//   Turns on and off a light emitting diode(LED) connected to digital pin 13,
//   when pressing a pushbutton attached to pin 2.

//   The circuit:
//   - LED attached from pin 13 to ground
//   - pushbutton attached to pin 2 from +5V
//   - 10K resistor attached to pin 2 from ground

//   - Note: on most Arduinos there is already an LED on the board
//     attached to pin 13.


//   This example code is in the public domain.

//   http://www.arduino.cc/en/Tutorial/Button
// */

// // constants won't change. They're used here to set pin numbers:
// const int buttonPin = 36;     //SVR 管脚不支持上拉输入，但其它的管脚可以
// // const int buttonPin = 39;     //SVN
// //const int ledPin =  13;      // the number of the LED pin

// // variables will change:
// int buttonState = 0;         // variable for reading the pushbutton status

// void setup() {
//   // initialize the LED pin as an output:
//   pinMode(LED_BUILTIN, OUTPUT);
//   // initialize the pushbutton pin as an input:
//   pinMode(buttonPin, INPUT_PULLUP);
//   //pinMode(buttonPin, INPUT);
//   Serial.begin(9600);
// }

// void loop() {
//   // read the state of the pushbutton value:
//   buttonState = digitalRead(buttonPin);

//   // check if the pushbutton is pressed. If it is, the buttonState is HIGH:
//   if (buttonState == LOW) {
//     // turn LED on:
//     digitalWrite(LED_BUILTIN, HIGH);
//     Serial.println(1);
//   } 
//   if (buttonState == HIGH)  {
//     // turn LED off:
//     digitalWrite(LED_BUILTIN, LOW);
//     Serial.println(0);
//   }
//   delay(10);
// }
